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Substance-induced psychotic disorder matters because it explains psychosis that is directly caused by a substance and, crucially, resolves once that substance clears or abstinence is maintained. It is diagnosed as prominent hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → (false perceptions with no real stimulus) or delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → developing during or shortly after substance intoxication or withdrawal, in a pattern that would not be expected without the substance. For example, imagine a patient who develops vivid persecutory delusions during a stimulant binge, which then fully resolve within two weeks of stopping the drug. In practice, that resolution with abstinence is the defining feature separating this from a primary psychotic illness.

The psychotic symptoms must be temporally linked to substance use or withdrawal and must exceed what is expected from intoxication alone in severity or duration, distinguishing it from ordinary intoxication effects. Diagnosis typically requires the psychosis to persist beyond the expected duration of acute intoxication or withdrawal, yet still resolve within around a month of sustained abstinence. Take a patient whose hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → (false perceptions with no real stimulus) persist for three weeks after her last amfetamine use but have fully cleared by six weeks of confirmed abstinence. In practice, that pattern, delayed but eventual resolution with abstinence, supports substance-induced psychotic disorder rather than a primary illness.

• What does ICD-11 require before psychotic symptoms during drug use are labelled a substance-induced psychotic disorder?
• Which group of substances most commonly produces a psychotic disorder of this kind?
• How should the acute psychotic episode of a stimulant-induced psychosis usually be managed?

• Acute and transient psychotic disorder, arises without a clear substance trigger, unlike substance-induced psychotic disorder's direct link to intoxication or withdrawal.
• Schizophrenia, persists regardless of abstinence, whereas substance-induced psychotic disorder resolves once the substance is stopped and abstinence is sustained.
• Ordinary intoxication, brief perceptual disturbance during the substance's acute effects, rather than the more prominent, longer-lasting hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → or delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → of substance-induced psychotic disorder.
• Substance-induced psychotic disorder, symptoms clear within about a month of confirmed abstinence, unlike a primary psychotic illness, which does not resolve on this timescale.

• Family history is a risk factor rather than a diagnostic requirement.
• A positive screen confirms use but does not establish that the psychosis is substance-induced.
• A two-year requirement would exclude the condition, whose symptoms typically resolve within weeks.
• Antihistamines may cause delirium in overdose rather than this disorder.
• Antidepressants are not a typical cause of substance-induced psychosis.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.